Method of desensitizing a pressure sensitive recording sheet and the product thereof

Abstract

The pressure sensitive recording sheet is partially desensitized by applying an improved desensitizer to a predetermined area thereof. The improved desensitizer comprises a reaction product produced by the reaction of ammonia, amines, diamines or polyamines with glycidyl esters or glycidyl ethers. The improved desensitizer is hydrophobic and soluble in an oil vehicle.

What we claim is: 
     
       1. A method of desensitizing a pressure sensitive recording sheet comprising applying to a predetermined area of the pressure sensitive recording sheet a desensitizer which comprises a reaction product produced by the reaction of (1) ammonia, alkylamines, alkyleneamines selected from the group consisting essentially of ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine and triethylenetetramine, alkenylamines, cyclicamines or arylamines with (2) one member selected from the group consisting of alkylglycidylethers, cycloalkylglycidylethers, arylglycidylethers, alkenylglycidylethers, glycidylalkylates, glycidylalkenates and glycidylarylates. 
     
     
       2. A method of desensitizing a pressure sensitive recording sheet as defined in claim 1, in which said desensitizer is applied in the form of an ink to said area of said pressure sensitive recording sheet. 
     
     
       3. A method of desensitizing a pressure sensitive recording sheet as defined in claim 2, in which said desensitizer is applied in the form of an ink with an oil vehicle to said area of said pressure sensitive recording sheet. 
     
     
       4. The process of claim 1, wherein said step of applying comprises dissolving said reaction product in the solvent to form a solution and spraying said solution. 
     
     
       5. The process of claim 1, wherein said step of applying comprises using said reaction product in the solid form wherein said desensitizer is mixed and tempered with paraffin, japan wax and white pigment. 
     
     
       6. The method of claim 1, wherein said step of applying comprises dissolving said reaction product in a solvent to form a solution and spraying said solution. 
     
     
       7. The method of claim 1, wherein said step of applying comprises using said reaction product as a solid form wherein the densitizer is mixed and tempered with paraffin, japan wax and white pigment. 
     
     
       8. A partly desensitized, pressure sensitive recording sheet which is obtained according to the method defined in claim 1. 
     
     
       9. A method of desensitizing a pressure sensitive recording sheet comprising applying to a predetermined area of the pressure sensitive recording sheet a desensitizer which comprises a reaction product produced by the reaction of (1) ammonia, alkylamines, alkenylamines, cyclicamines or arylamines with (2) one member selected from the group consisting of alkylglycidylethers, cycloalkylglycidylethers, arylglycidylethers, alkenylglycidylethers, glycidylalkylates, glycidylalkenates and glycidylarylates.